On 2018-12-28 00:02, demxic wrote:
El mar., 25 de dic. de 2018 a la(s) 13:06, Paul Eggert escribió:
demxic wrote:
I would like to draw your attention to the fact that Mexico's City Daylight time ended on October 28 2018 03:00 AM local time. That is the exact moment when clocks moved backward to 02:00 AM. What's your source for this information? CENAM <https://www.cenam.mx/hora_oficial/> says "el horario de verano inicia el primer domingo de abril a las 2h00 de la mañana, momento en el cual los relojes se adelantan una hora, y termina el último domingo de octubre a las 2h00 de la mañana, instante en el que los relojes se atrasan una hora." This suggests that daylight saving time ends at 02:00, not 03:00. Thank you for your quick response. It seems like CENAM information has not been updated for a while, I cannot find any official source but it was in newspapers all around and I am living in Mexico City and witnessed the change.
How did you witness the change? Did you see clocks being manually reset? When people change clocks may be unrelated to the official timekeeping rules which apply to legal situations, and may differ depending on regulations e.g. the BIVA/BMV stock markets keep US time. Timekeeping in Mexico varies as it follows US zones, dates, and rules near the US border and Mexican zones, dates, and rules farther away; as articles will vary with who writes, where they are based, whether they know enough to write comprehensively or customized for target locations, or may lack knowledge and skip research. The lack of specificity in these articles argues for the latter - a hundred or few words about the time change. If CENAM information has not been updated for a while, perhaps there have been no significant legal changes announced by federal or state governments. The tzdb maintainers are reluctant to base any changes on often vague statements in online articles, requiring at least semi-official press releases with comprehensive details, preferring links to or publications of officially enacted laws or regulations in official gazettes or registers by the responsible timekeeping or standards agency or ministry.
https://www.marca.com/claro-mx/trending/2018/10/22/5bccfb0a46163fe0528b460d.... Un nuevo cambio de horario <https://www.marca.com/claro-mx/trending/2018/03/19/5aa6066eca4741987d8b456e.html>se avecina. El domingo 28 de octubre entra en vigor el horario de invierno 2018 en México y en el mundo; la buena noticia es que deberás de atrasar tu reloj una hora, ganando sesenta minutos de sueño. El cambio se dará durante la madrugada del domingo, por lo que a las 3 AM los relojes tendrán que ponerse a las 2 AM. El horario de invierno permanecerá vigente hasta el día 7 de abril del 2019. I am sorry I cannot still confirm this issue, I have sent an email to Mexico´s CETRAM and I am waiting for an official response. -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
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